In ancient times, religious wars occurred especially in Europe and Arab countries. In the Middle Ages, Christianity was not only an ideology in Europe, but also gradually became a powerful political force in the feudal ruling class. The church puts the superstructure of philosophy, politics and law under theological control and has the right to directly mobilize troops to suppress and slaughter pagans. Religious influence permeates all fields of social life, and almost everyone is a Christian. In Arab Muslim countries, religion and politics are integrated. Since Islam was founded in the early 7th century, it has laid the institutional foundation for the integration of politics and religion, and religious leaders are political leaders. In this case, the political struggles of all classes and ethnic groups are often carried out in the form of religious struggles, resulting in a series of religious wars. During the Reformation, old and new believers did not understand tolerance and often persecuted each other in the name of heresy. Coupled with the complex political relations and interests between countries, wars in Europe continued in the sixteenth and seventeenth centuries, and these wars were often covered with religious colors. For example, in order to protect its independent trade status with America, Spain sent an "Armada" to Britain in the name of defending old religions and cracking down on Protestantism. The most serious religious war is the "Thirty Years War". At first, the Thirty Years' War was just a dispute between old and new religions within the Holy Roman Empire. The reason was that the Emperor of the Holy Roman Empire suppressed Protestants in China, which aroused the resistance of Bohemian Protestants and sought independence. Later, Denmark, Sweden, France and so on also joined the fray because of their respective interests, and finally evolved into a European war. 16 18 years, after the Bohemians who believed in Protestantism launched a rebellion, Ferdinand II (Ferdinand II, 16 19- 1637) quickly sent troops to suppress it, persecuted Protestants afterwards and ordered the abolition of all religious freedom. The Suffering of the War-The result of Jacques Kellott's Bohemian War 1648 shocked Protestant countries such as Britain, Holland, Sweden and Denmark, worried about the growing influence of the old religion, and deliberately sent troops to intervene. With the support of Britain, Denmark sent 60,000 troops into the Holy Roman Empire in 1625. Denmark is ostensibly a Protestant who sympathizes with the Holy Roman Empire. In fact, the competition for new territory is the main reason for Denmark to send troops. Wallenstein, a Bohemian aristocrat, realized that this was a war of vital importance to the survival of the country and recruited troops at his own expense to stop the Danish invasion. 1629 The two armies made peace and signed the Lubeck Peace Treaty. At this point in the war, the old Christians gained the upper hand. Ferdinand II pursued the victory and issued a decree: Protestants were required to return the religious territory and property acquired after AD 1552. After the defeat of Denmark, in 1630, Sweden, which was uneasy about the influence of the holy Roman Empire in and out of the Baltic Sea, also organized a Protestant army to declare war on the holy Roman Empire. King gustavus Adolphus of Sweden, known as the "Nordic Lion", was a military genius. He defeated the troops of the Holy Roman Empire with the new tactics of "five infantry columns and four cavalry columns". Just as the war was going well, adolphs was killed by a big hug, and the Swedish military situation was in a hurry. In order to support friendly countries, France, which was originally supported behind the scenes, also sent troops to the war. Although France is a typical old-fashioned religious country, it has been silently supporting Protestant countries because it wants to weaken its neighboring holy Roman Empire and expand its political power. At that time, the only powerful ally of the Holy Roman Empire was Spain, because the emperors of both countries were members of the Habsburg family, but Spain itself had many troubles. After the failure of the British campaign, we had to deal with Portugal and the Netherlands, which were independent one after another. To make matters worse, the Holy Roman Emperor Ferdinand II died in A.D. 1637, and the Protestants in China had long understood that the war was against the Habsburg family, so they declared neutrality. The old religious army of the Holy Roman Empire can only cope. In fact, as early as 1644, representatives of countries suffering from the tragic war began to discuss how to end this war in West Faria. Talking about rebellion is mainly dominated by France. During this period, he talked about rebellion, and it was not until 1648 that the Treaty of Westphalia was formally signed. The most important significance of the peace treaty is to recognize that old and new religions are equal. According to the religious category of the armed forces in the war, the types of war can be divided into religious foreign wars and religious internal wars. 1. Religious foreign war is a kind of war waged by religious forces against people with different religious beliefs ("pagans"). Example: Crusade, Jihad 2. Intra-religious wars are generally wars between different sects of the same religion. The Thirty Years' War was a war waged by different religions and sects for their own interests. Its background and reasons are extremely complicated. It is usually produced under the specific conditions that religion is closely related to social and political life, and it is the result of the comprehensive action of religious factors and political, economic and military factors. Religious wars reflect the opposition of political and economic interests of different social groups, and are essentially "carried out for very clear material class interests." It is based on devout and fanatical religious beliefs, arousing the strong revenge psychology of believers with spiritual factors, making the war extremely fierce and cruel.